X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fdaemonize%2Fdaemonize.c;h=ff12bfce3f7d15dfcab1053f7a673cae23963125;hp=861b0fc79cb961d5754899c23b31f0532f8edd32;hb=0284423676209380a2e07086b9b356096a2f93e6;hpb=75a2f5a4b855ba9efd9e6de954eb35fda633909e;ds=sidebyside

diff --git a/ccan/daemonize/daemonize.c b/ccan/daemonize/daemonize.c
index 861b0fc7..ff12bfce 100644
--- a/ccan/daemonize/daemonize.c
+++ b/ccan/daemonize/daemonize.c
@@ -3,6 +3,7 @@
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <fcntl.h>
 
 /* This code is based on Stevens Advanced Programming in the UNIX
  * Environment. */
@@ -21,10 +22,20 @@ bool daemonize(void)
 	close(STDOUT_FILENO);
 	close(STDERR_FILENO);
 
+	/* Many routines write to stderr; that can cause chaos if used
+	 * for something else, so set it here. */
+	if (open("/dev/null", O_WRONLY) != 0)
+		return false;
+	if (dup2(0, STDERR_FILENO) != STDERR_FILENO)
+		return false;
+	close(0);
+
 	/* Session leader so ^C doesn't whack us. */
 	setsid();
 	/* Move off any mount points we might be in. */
-	chdir("/");
+	if (chdir("/") != 0)
+		return false;
+
 	/* Discard our parent's old-fashioned umask prejudices. */
 	umask(0);
 	return true;